.el-container {
  height: 100%;
  width: 100%;
  margin-bottom: 0px;
}

.el-container {

  .el-header,.el-footer
   {
    display: contents;
    height: auto;
    background-color: #B3C0D1;
    color: #333;
    text-align: center;
    line-height: 1.2;

    .container {
      display: flex;
      /* 使用Flex布局 */
      justify-content: center;
      /* 水平居中 */
    }

    .d3v {
      display: flex;
      justify-content: center;
      align-items: center;

      .textSpan {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;

        .volume-text {
          margin: 10px;

          .span-vertical {
            display: block;
          }
        }
      }
    }

  }

  .el-main {
    background-color: #d7f9ff;
    color: #333;
    text-align: center;
    line-height: 160px;
    .plot {
      width: 95%;
      height: 65%;
      float: left
    }
  }
}

.element {
  margin-top: 2em;
  margin-left: auto;
  margin-right: auto;
}

.item {
  margin: 0px;
  /* 元素之间的间距 */
  padding: 10px;
  /* 元素内部的间距 */
}

.element {
  margin-top: 0%;
  margin-left: 20%;
  margin-right: 20%;
}